/*
 * Copyright 2011 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package tw.idv.gasolin.pycontw2012.ui.tablet;

import android.content.Intent;
import android.content.res.Resources;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ListPopupWindow;
import android.widget.PopupWindow;
import android.widget.TextView;

import tw.idv.gasolin.pycontw2012.R;
import tw.idv.gasolin.pycontw2012.provider.CoscupContract;
import tw.idv.gasolin.pycontw2012.ui.BaseActivity;
import tw.idv.gasolin.pycontw2012.ui.SessionDetailFragment;
import tw.idv.gasolin.pycontw2012.ui.TracksAdapter;
import tw.idv.gasolin.pycontw2012.util.NotifyingAsyncQueryHandler;
import tw.idv.gasolin.pycontw2012.util.UIUtils;

/**
 * A tablet-specific fragment that is a giant {@link android.widget.Spinner}
 * -like widget. It shows a {@link ListPopupWindow} containing a list of tracks,
 * using {@link TracksAdapter}.
 * 
 * Requires API level 11 or later since {@link ListPopupWindow} is API level
 * 11+.
 */
public class TracksDropdownFragment extends Fragment implements
    NotifyingAsyncQueryHandler.AsyncQueryListener,
    AdapterView.OnItemClickListener, PopupWindow.OnDismissListener {

    public static final String NEXT_TYPE_SESSIONS = "sessions";

    private boolean mAutoloadTarget = true;
    private Cursor mCursor;
    private TracksAdapter mAdapter;

    private ListPopupWindow mListPopupWindow;
    private ViewGroup mRootView;
    private TextView mTitle;
    private TextView mAbstract;

    private NotifyingAsyncQueryHandler mHandler;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mHandler = new NotifyingAsyncQueryHandler(
            getActivity().getContentResolver(),
            this);
        mAdapter = new TracksAdapter(getActivity());

        if ( savedInstanceState != null ) {
            // Prevent auto-load behavior on orientation change.
            mAutoloadTarget = false;
        }

        reloadFromArguments(getArguments());
    }

    public void reloadFromArguments(Bundle arguments) {
        // Teardown from previous arguments
        if ( mListPopupWindow != null ) {
            mListPopupWindow.setAdapter(null);
        }
        if ( mCursor != null ) {
            getActivity().stopManagingCursor(mCursor);
            mCursor = null;
        }
        mHandler.cancelOperation(TracksAdapter.TracksQuery._TOKEN);

        // Load new arguments
        final Intent intent = BaseActivity.fragmentArgumentsToIntent(arguments);
        final Uri tracksUri = intent.getData();
        if ( tracksUri == null ) {
            return;
        }

        // Filter our tracks query to only include those with valid results
        String[] projection = TracksAdapter.TracksQuery.PROJECTION;
        String selection = null;
        // Only show tracks with at least one session
        projection = TracksAdapter.TracksQuery.PROJECTION_WITH_SESSIONS_COUNT;
        selection = CoscupContract.Tracks.SESSIONS_COUNT + ">0";

        // Start background query to load tracks
        mHandler.startQuery(TracksAdapter.TracksQuery._TOKEN, null, tracksUri,
            projection, selection, null, CoscupContract.Tracks.DEFAULT_SORT);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
        mRootView = (ViewGroup) inflater.inflate(
            R.layout.fragment_tracks_dropdown, null);
        mTitle = (TextView) mRootView.findViewById(R.id.track_title);
        mAbstract = (TextView) mRootView.findViewById(R.id.track_abstract);

        mRootView.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                mListPopupWindow = new ListPopupWindow(getActivity());
                mListPopupWindow.setAdapter(mAdapter);
                mListPopupWindow.setModal(true);
                mListPopupWindow.setContentWidth(400);
                mListPopupWindow.setAnchorView(mRootView);
                mListPopupWindow.setOnItemClickListener(TracksDropdownFragment.this);
                mListPopupWindow.show();
                mListPopupWindow.setOnDismissListener(TracksDropdownFragment.this);
            }
        });
        return mRootView;
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
    }

    /** {@inheritDoc} */
    public void onQueryComplete(int token, Object cookie, Cursor cursor) {
        if ( getActivity() == null || cursor == null ) {
            return;
        }

        mCursor = cursor;
        getActivity().startManagingCursor(mCursor);

        // If there was a last-opened track, load it. Otherwise load the first
        // track.
        cursor.moveToFirst();
        String lastTrackID = UIUtils.getLastUsedTrackID(getActivity());
        if ( lastTrackID != null ) {
            while ( !cursor.isAfterLast() ) {
                if ( lastTrackID.equals(cursor.getString(TracksAdapter.TracksQuery.TRACK_ID)) ) {
                    break;
                }
                cursor.moveToNext();
            }

            if ( cursor.isAfterLast() ) {
                loadTrack(null, mAutoloadTarget);
            } else {
                loadTrack(cursor, mAutoloadTarget);
            }
        } else {
            loadTrack(null, mAutoloadTarget);
        }

        mAdapter.setHasAllItem(true);
        mAdapter.changeCursor(mCursor);
    }

    /** {@inheritDoc} */
    public void onItemClick(AdapterView<?> parent, View view, int position,
        long id) {
        final Cursor cursor = (Cursor) mAdapter.getItem(position);
        loadTrack(cursor, true);

        if ( cursor != null ) {
            UIUtils.setLastUsedTrackID(getActivity(),
                cursor.getString(TracksAdapter.TracksQuery.TRACK_ID));
        } else {
            UIUtils.setLastUsedTrackID(getActivity(),
                CoscupContract.Tracks.ALL_TRACK_ID);
        }

        if ( mListPopupWindow != null ) {
            mListPopupWindow.dismiss();
        }
    }

    public void loadTrack(Cursor cursor, boolean loadTargetFragment) {
        final String trackId;
        final int trackColor;
        final Resources res = getResources();

        if ( cursor != null ) {
            trackColor = cursor.getInt(TracksAdapter.TracksQuery.TRACK_COLOR);
            trackId = cursor.getString(TracksAdapter.TracksQuery.TRACK_ID);

            mTitle.setText(cursor.getString(TracksAdapter.TracksQuery.TRACK_NAME));
            mAbstract.setText(cursor.getString(TracksAdapter.TracksQuery.TRACK_ABSTRACT));

        } else {
            trackColor = res.getColor(R.color.all_track_color);
            trackId = CoscupContract.Tracks.ALL_TRACK_ID;

            mTitle.setText(R.string.all_sessions_title);
            mAbstract.setText(R.string.all_sessions_subtitle);
        }

        boolean isDark = UIUtils.isColorDark(trackColor);
        mRootView.setBackgroundColor(trackColor);

        if ( isDark ) {
            mTitle.setTextColor(res.getColor(R.color.body_text_1_inverse));
            mAbstract.setTextColor(res.getColor(R.color.body_text_2_inverse));
            mRootView.findViewById(R.id.track_dropdown_arrow)
                .setBackgroundResource(R.drawable.track_dropdown_arrow_light);
        } else {
            mTitle.setTextColor(res.getColor(R.color.body_text_1));
            mAbstract.setTextColor(res.getColor(R.color.body_text_2));
            mRootView.findViewById(R.id.track_dropdown_arrow)
                .setBackgroundResource(R.drawable.track_dropdown_arrow_dark);
        }

        if ( loadTargetFragment ) {
            final Intent intent = new Intent(Intent.ACTION_VIEW);
            final Uri trackUri = CoscupContract.Tracks.buildTrackUri(trackId);
            intent.putExtra(SessionDetailFragment.EXTRA_TRACK, trackUri);

            if ( cursor == null ) {
                intent.setData(CoscupContract.Sessions.CONTENT_URI);
            } else {
                intent.setData(CoscupContract.Tracks.buildSessionsUri(trackId));
            }

            ( (BaseActivity) getActivity() ).openActivityOrFragment(intent);
        }
    }

    public void onDismiss() {
        mListPopupWindow = null;
    }
}
